Furnace-door device.



A. G. ELVIN.

FURNACE DOOR DEVICE. APPLICATION FILED'O'CT-S, 1914.

119mm. PatentedJuly1L1916.

WITNESSES ALBERT G. ELVIN, OF SOMERVILLE, NEW, JERSEY.

FURNACE-noon DEVICE.

To all whom it may concern:

Be it known thatiI, ALBERT G. EnvIN, a citizen of the United States, residing at Somerville, in the county of Somerset and -State of New Jersey, have invented a certain new and useful Improvement in Furnace-Door Devices, of which improvement the following is a specification.

This invention relates to apparatus for operating doors of boiler furnaces, and particularly fire doors for locomotive boilers, the principal object being to provlde an improved combined fluid pressure and hand operated door device of the type having ahorizontal cylinder and piston and a pair of pivoted fire doors adapted to swlng laterally and vertically and to close by gravity.

According to my improvement, a plvoted hand lever is provided having a short curved arm adapted to engage the piston, or

a pin attached thereto, and move the piston horizontally in the cylinder when the longarm of the lever is turned downward, thereby operating the door as. if fluid pressure were admitted to the cylinder.

In the accompanying drawing: Figure 1 is a view, partly in front elevation and partly in vertical section showing the upper portion of a pair of doors and operating mechanism embodying my improve ment; Fig. 2, a-vertical transverse section, taken substantially on the line 2-2 of Flg. 1; Fig. 3, an end elevation of the same; and Fig. 4:, an elevation of the latch device with the lever indicated in section.

According to the construction shown in the drawing, my improvement illustrated in connection with .a pair of furnace doors,

5 and 5 mounted to swing laterally and vertically on the respective pins, 6 and 6, supported in the door frame, 7, and operated by a fluid pressure motor comprising a horizontal cylinder, 3, having a flange, 3, also supported on the bolts or pins, 6, and containing a piston, 9, carrying a pin, 11, extending through a slot, 12, in the side of the cylinder and connected by a link, 10, with the upper portion of one of the doors, such as 5*, above the pivot pin, 6*. The doors are also provided with intermeshing segmental gears, 4 and 4?, whereby both doors are caused to swing together in opening and closing. The link, 10, may be provided with an open slot in its end in order that the link -may be quickly disconnected from the piston whenever it becomes neces- Specification of Letters Patent. Patented J 11 1 11, 19115, Application fil'ed October 5, 1914. Serial No. 865,010.

sary to remove the cylinder. The link may then be turned upward to the position indicated in dotted lines, Fig: 1.

According to my improvement, a hand lever, 13, is pivoted on the frame, preferably on the door pivot pin, 6, and is provided at one end with a short curved arm, 13*, extending upwardly through a slot, 3", in the cylinder, and into a slot or recess, 9?, formed in the piston, 9, where it engages the pin, 11, for moving the piston. In its normal position, the hand lever extends upward and outward in a plane substantially parallel with that of the doors, and is adapted to be turned downward around the side of the door framein the opening movement, during which the curved arm engages the pin, 11, and forces the piston outward, thus .when in its normal closed position, and prevent the same from slipping out of the notch, 18. A'safety latch, 21,.hav'ing a handle, 22, is pivotally mounted in the lower part of the latch frame and is adapted to be turned up to the position shown in Fig. 4, and bear against the side of the lever, 13, when it is desired to lock the same in the notch, 20, with the doors in the full open position. This is used principally for the purpose of preventing accidental closing of the doors when the engine is in the shop and the doors are set to the full open position for inspection and repairs in the firebox.

-VVhen operating manually, the leverage of the hand lever gradually increases as it is turned downward from its normal position, since the pin, 11, slides along the upper curved surface of thearm, 13 and the distance between the centers of the pins, Sand 11, gradually diminishes until the door reaches the full open'position, thus manually increasing the power of the hand lever. In moving the hand lever from its normal position it is first pulled forward to compress the spring plunger and release the lever from the latch, -18." The lever is then turned" downward .to either'one of the other notches desired, during which movement the short 'curved a-rm, 13, engages the pin,l1, of the piston and forces the same outward thus opening the doors in the same manner as when fluid pressure is admitted to the cylinderto. actuate the piston. When the piston is actuated by air or other'iiuid under pressure, however, the hand lever does not move;

as the same is held in its normal position while the elongated recess, 9, in the piston,

piston without actuating the arm, 13*, of the hand 9, allows for the movement of the lever. This comprises a simple and {convenient mechanism for operating the doors either manually or by fluid pressure as may be desired.

,Having now described my inventiomwhat I claim as new and 'desireto secure by Let- I ters Patent is:

. tion of a pair of doors to'swinglaterally and vertically, a cylinder,

1; In affurnace door device,-the combina mounted on pivots a piston therein, a pin and link connectingthe-same to one of sald doors, means opera;

ually operating the piston.

tively connecting said doors, and a hand lever mounted at an intermediate point on I one of the: door pivots and having a curved arm at its end engaging said pin for manhaving a notch for holding the lever in the full open position,- and a movable safety latch for locking the lever in said notch. ALBERT G. ELVIN.

Witnesses:

C. E. FLODINE,

' A. J. DENNELLEY. 

